On Tue, 29 Aug 2000 19:08:02 BST, Barry Samuels writes:
>Mains electricity supply (although the computer is on an UPS).
>Faulty component somewhere.

s/faulty/not properly grounded/ ?

A tip:
- Does it happen with headphones also?
  - Your speakers may have other grounding than your PC[1], so current may 
    build up under some circumstances.

hth,
&rw

1: I guess they arenĀ“t powered via the UPS?
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